To prevent death, serious injury and
vehicle damage:
NEVER operate vehicle engine1.
inside garage, EVEN IF doors and
windows are open.
WARNING: This product contains2.
lead, which is a chemical known to
the State of California to cause cancer
and birth defects or other reproductive
harm. (California Health & Safety
Code § 25249.5, et seq.)
Wear ANSI-approved safety goggles3.
and heavy-duty work gloves during
use.
Keep tester and self clear of hot or4.
moving engine parts.
Do not connect ground clamp to5.
carburetor or fuel lines.
Inspect before use; do not use if parts6.
loose or damaged.
Use for intended purposes only.7.
Read vehicle’s service manual and8.
follow directions and precautions for
use.
Functions:
The CHECK LIGHT illuminates to show
a spark passing through it.
The wire from the coil is attached to the
metal post on the bulb end. The black
boot leads to the spark plug/ground.
The EXTENSION is used to connect the
spark checker to recessed plugs.
The black boot of the check light connects
to the exposed metal tip of the extension.
The opposite end of the extension con-
nects to the spark plug.
The GROUND CLAMP is used to con-
nect the check light to a grounded part
of the engine.
The black boot of the check light connects
to the exposed metal tip of the clamp. The
alligator clamp connects to a grounded
portion of the engine.
Test Results
Result Likely Cause
Engine Bulb
Does not start Flashes Fuel system fault
Does not start Does not ash Ignition fault
Starts Flashes weak/inconsistent Ignition fault
Bulb Replacement:
CapBase
Bulb/Spring
Assembly
1. Unthread the Cap from the Base of the
Check Light and remove the Bulb/Spring
Assembly.
Remove the Sleeve from the Spring. Re-2.
move the old Bulb and dispose of properly.
BulbSleeve Spring
3. Insert a new GE part NE51H (B2A) or
equivalent Bulb into the Spring. Insert the
Bulb, cover rst, into the wider end of the
Spring.
Place the Sleeve over the base of the Bulb4.
and Spring Combination.
Insert the Bulb and Spring into the Cap.5.
Reassemble the Cap onto the Base.
Wash hands thoroughly after assembly;6.
Bulb and Bulb Connector contain lead.
Distributed exclusively by Harbor Freight Tools.
SAVE THESE INSTRUCTIONS.
08b Made in China.
